| |
| /*--------------------------------------------------------------------*/ |
| /*--- The core dispatch loop, for jumping to a code address. ---*/ |
| /*--- dispatch-ppc32-linux.S ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2005-2010 Cerion Armour-Brown <cerion@open-works.co.uk> |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #if defined(VGP_ppc32_linux) |
| |
| #include "config.h" |
| #include "pub_core_basics_asm.h" |
| #include "pub_core_dispatch_asm.h" |
| #include "pub_core_transtab_asm.h" |
| #include "libvex_guest_offsets.h" /* for OFFSET_ppc32_CIA */ |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- ---*/ |
| /*--- The dispatch loop. VG_(run_innerloop) is used to ---*/ |
| /*--- run all translations except no-redir ones. ---*/ |
| /*--- ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /*----------------------------------------------------*/ |
| /*--- Preamble (set everything up) ---*/ |
| /*----------------------------------------------------*/ |
| |
| /* signature: |
| UWord VG_(run_innerloop) ( void* guest_state, UWord do_profiling ); |
| */ |
| .text |
| .globl VG_(run_innerloop) |
| .type VG_(run_innerloop), @function |
| VG_(run_innerloop): |
| /* r3 holds guest_state */ |
| /* r4 holds do_profiling */ |
| |
| /* ----- entry point to VG_(run_innerloop) ----- */ |
| /* For Linux/ppc32 we need the SysV ABI, which uses |
| LR->4(parent_sp), CR->anywhere. |
| (The AIX ABI, used on Darwin, |
| uses LR->8(prt_sp), CR->4(prt_sp)) |
| */ |
| |
| /* Save lr */ |
| mflr 0 |
| stw 0,4(1) |
| |
| /* New stack frame */ |
| stwu 1,-496(1) /* sp should maintain 16-byte alignment */ |
| |
| /* Save callee-saved registers... */ |
| /* r3, r4 are live here, so use r5 */ |
| lis 5,VG_(machine_ppc32_has_FP)@ha |
| lwz 5,VG_(machine_ppc32_has_FP)@l(5) |
| cmplwi 5,0 |
| beq LafterFP1 |
| |
| /* Floating-point reg save area : 144 bytes */ |
| stfd 31,488(1) |
| stfd 30,480(1) |
| stfd 29,472(1) |
| stfd 28,464(1) |
| stfd 27,456(1) |
| stfd 26,448(1) |
| stfd 25,440(1) |
| stfd 24,432(1) |
| stfd 23,424(1) |
| stfd 22,416(1) |
| stfd 21,408(1) |
| stfd 20,400(1) |
| stfd 19,392(1) |
| stfd 18,384(1) |
| stfd 17,376(1) |
| stfd 16,368(1) |
| stfd 15,360(1) |
| stfd 14,352(1) |
| LafterFP1: |
| |
| /* General reg save area : 72 bytes */ |
| stw 31,348(1) |
| stw 30,344(1) |
| stw 29,340(1) |
| stw 28,336(1) |
| stw 27,332(1) |
| stw 26,328(1) |
| stw 25,324(1) |
| stw 24,320(1) |
| stw 23,316(1) |
| stw 22,312(1) |
| stw 21,308(1) |
| stw 20,304(1) |
| stw 19,300(1) |
| stw 18,296(1) |
| stw 17,292(1) |
| stw 16,288(1) |
| stw 15,284(1) |
| stw 14,280(1) |
| /* Probably not necessary to save r13 (thread-specific ptr), |
| as VEX stays clear of it... but what the hey. */ |
| stw 13,276(1) |
| |
| /* It's necessary to save/restore VRSAVE in the AIX / Darwin ABI. |
| The Linux kernel might not actually use VRSAVE for its intended |
| purpose, but it should be harmless to preserve anyway. */ |
| /* r3, r4 are live here, so use r5 */ |
| lis 5,VG_(machine_ppc32_has_VMX)@ha |
| lwz 5,VG_(machine_ppc32_has_VMX)@l(5) |
| cmplwi 5,0 |
| beq LafterVMX1 |
| |
| #ifdef HAS_ALTIVEC |
| /* VRSAVE save word : 32 bytes */ |
| mfspr 5,256 /* vrsave reg is spr number 256 */ |
| stw 5,244(1) |
| |
| /* Alignment padding : 4 bytes */ |
| |
| /* Vector reg save area (quadword aligned) : 192 bytes */ |
| li 5,224 |
| stvx 31,5,1 |
| li 5,208 |
| stvx 30,5,1 |
| li 5,192 |
| stvx 29,5,1 |
| li 5,176 |
| stvx 28,5,1 |
| li 5,160 |
| stvx 27,5,1 |
| li 5,144 |
| stvx 26,5,1 |
| li 5,128 |
| stvx 25,5,1 |
| li 5,112 |
| stvx 25,5,1 |
| li 5,96 |
| stvx 23,5,1 |
| li 5,80 |
| stvx 22,5,1 |
| li 5,64 |
| stvx 21,5,1 |
| li 5,48 |
| stvx 20,5,1 |
| #endif |
| |
| LafterVMX1: |
| |
| /* Save cr */ |
| mfcr 0 |
| stw 0,44(1) |
| |
| /* Local variable space... */ |
| |
| /* 32(sp) used later to check FPSCR[RM] */ |
| |
| /* r3 holds guest_state */ |
| /* r4 holds do_profiling */ |
| mr 31,3 /* r31 (generated code gsp) = r3 */ |
| stw 3,28(1) /* spill orig guest_state ptr */ |
| |
| /* 24(sp) used later to stop ctr reg being clobbered */ |
| /* 20(sp) used later to load fpscr with zero */ |
| /* 8:16(sp) free */ |
| |
| /* Linkage Area (reserved) |
| 4(sp) : LR |
| 0(sp) : back-chain |
| */ |
| |
| /* CAB TODO: Use a caller-saved reg for orig guest_state ptr |
| - rem to set non-allocateable in isel.c */ |
| |
| /* hold dispatch_ctr in r29 */ |
| lis 5,VG_(dispatch_ctr)@ha |
| lwz 29,VG_(dispatch_ctr)@l(5) |
| |
| /* set host FPU control word to the default mode expected |
| by VEX-generated code. See comments in libvex.h for |
| more info. */ |
| lis 5,VG_(machine_ppc32_has_FP)@ha |
| lwz 5,VG_(machine_ppc32_has_FP)@l(5) |
| cmplwi 5,0 |
| beq LafterFP2 |
| |
| /* get zero into f3 (tedious) */ |
| /* note: fsub 3,3,3 is not a reliable way to do this, |
| since if f3 holds a NaN or similar then we don't necessarily |
| wind up with zero. */ |
| li 5,0 |
| stw 5,20(1) |
| lfs 3,20(1) |
| mtfsf 0xFF,3 /* fpscr = f3 */ |
| LafterFP2: |
| |
| /* set host AltiVec control word to the default mode expected |
| by VEX-generated code. */ |
| lis 5,VG_(machine_ppc32_has_VMX)@ha |
| lwz 5,VG_(machine_ppc32_has_VMX)@l(5) |
| cmplwi 5,0 |
| beq LafterVMX2 |
| |
| #ifdef HAS_ALTIVEC |
| vspltisw 3,0x0 /* generate zero */ |
| mtvscr 3 |
| #endif |
| |
| LafterVMX2: |
| |
| /* make a stack frame for the code we are calling */ |
| stwu 1,-16(1) |
| |
| /* fetch %CIA into r3 */ |
| lwz 3,OFFSET_ppc32_CIA(31) |
| |
| /* fall into main loop (the right one) */ |
| /* r4 = do_profiling. It's probably trashed after here, |
| but that's OK: we don't need it after here. */ |
| cmplwi 4,0 |
| beq VG_(run_innerloop__dispatch_unprofiled) |
| b VG_(run_innerloop__dispatch_profiled) |
| /*NOTREACHED*/ |
| |
| /*----------------------------------------------------*/ |
| /*--- NO-PROFILING (standard) dispatcher ---*/ |
| /*----------------------------------------------------*/ |
| |
| .global VG_(run_innerloop__dispatch_unprofiled) |
| VG_(run_innerloop__dispatch_unprofiled): |
| /* At entry: Live regs: |
| r1 (=sp) |
| r3 (=CIA = next guest address) |
| r29 (=dispatch_ctr) |
| r31 (=guest_state) |
| */ |
| /* Has the guest state pointer been messed with? If yes, exit. |
| Also set up & VG_(tt_fast) early in an attempt at better |
| scheduling. */ |
| lis 5,VG_(tt_fast)@ha |
| addi 5,5,VG_(tt_fast)@l /* & VG_(tt_fast) */ |
| andi. 0,31,1 |
| bne gsp_changed |
| |
| /* save the jump address in the guest state */ |
| stw 3,OFFSET_ppc32_CIA(31) |
| |
| /* Are we out of timeslice? If yes, defer to scheduler. */ |
| subi 29,29,1 |
| cmplwi 29,0 |
| beq counter_is_zero |
| |
| /* try a fast lookup in the translation cache */ |
| /* r4 = VG_TT_FAST_HASH(addr) * sizeof(FastCacheEntry) |
| = ((r3 >>u 2) & VG_TT_FAST_MASK) << 3 */ |
| rlwinm 4,3,1, 29-VG_TT_FAST_BITS, 28 /* entry# * 8 */ |
| add 5,5,4 /* & VG_(tt_fast)[entry#] */ |
| lwz 6,0(5) /* .guest */ |
| lwz 7,4(5) /* .host */ |
| cmpw 3,6 |
| bne fast_lookup_failed |
| |
| /* Found a match. Call .host. */ |
| mtctr 7 |
| bctrl |
| |
| /* On return from guest code: |
| r3 holds destination (original) address. |
| r31 may be unchanged (guest_state), or may indicate further |
| details of the control transfer requested to *r3. |
| */ |
| /* start over */ |
| b VG_(run_innerloop__dispatch_unprofiled) |
| /*NOTREACHED*/ |
| |
| /*----------------------------------------------------*/ |
| /*--- PROFILING dispatcher (can be much slower) ---*/ |
| /*----------------------------------------------------*/ |
| |
| .global VG_(run_innerloop__dispatch_profiled) |
| VG_(run_innerloop__dispatch_profiled): |
| /* At entry: Live regs: |
| r1 (=sp) |
| r3 (=CIA = next guest address) |
| r29 (=dispatch_ctr) |
| r31 (=guest_state) |
| */ |
| /* Has the guest state pointer been messed with? If yes, exit. |
| Also set up & VG_(tt_fast) early in an attempt at better |
| scheduling. */ |
| lis 5,VG_(tt_fast)@ha |
| addi 5,5,VG_(tt_fast)@l /* & VG_(tt_fast) */ |
| andi. 0,31,1 |
| bne gsp_changed |
| |
| /* save the jump address in the guest state */ |
| stw 3,OFFSET_ppc32_CIA(31) |
| |
| /* Are we out of timeslice? If yes, defer to scheduler. */ |
| subi 29,29,1 |
| cmplwi 29,0 |
| beq counter_is_zero |
| |
| /* try a fast lookup in the translation cache */ |
| /* r4 = VG_TT_FAST_HASH(addr) * sizeof(FastCacheEntry) |
| = ((r3 >>u 2) & VG_TT_FAST_MASK) << 3 */ |
| rlwinm 4,3,1, 29-VG_TT_FAST_BITS, 28 /* entry# * 8 */ |
| add 5,5,4 /* & VG_(tt_fast)[entry#] */ |
| lwz 6,0(5) /* .guest */ |
| lwz 7,4(5) /* .host */ |
| cmpw 3,6 |
| bne fast_lookup_failed |
| |
| /* increment bb profile counter */ |
| srwi 4,4,1 /* entry# * sizeof(UInt*) */ |
| addis 6,4,VG_(tt_fastN)@ha |
| lwz 9,VG_(tt_fastN)@l(6) |
| lwz 8,0(9) |
| addi 8,8,1 |
| stw 8,0(9) |
| |
| /* Found a match. Call .host. */ |
| mtctr 7 |
| bctrl |
| |
| /* On return from guest code: |
| r3 holds destination (original) address. |
| r31 may be unchanged (guest_state), or may indicate further |
| details of the control transfer requested to *r3. |
| */ |
| /* start over */ |
| b VG_(run_innerloop__dispatch_profiled) |
| /*NOTREACHED*/ |
| |
| /*----------------------------------------------------*/ |
| /*--- exit points ---*/ |
| /*----------------------------------------------------*/ |
| |
| gsp_changed: |
| /* Someone messed with the gsp (in r31). Have to |
| defer to scheduler to resolve this. dispatch ctr |
| is not yet decremented, so no need to increment. */ |
| /* %CIA is NOT up to date here. First, need to write |
| %r3 back to %CIA, but without trashing %r31 since |
| that holds the value we want to return to the scheduler. |
| Hence use %r5 transiently for the guest state pointer. */ |
| lwz 5,44(1) /* original guest_state ptr */ |
| stw 3,OFFSET_ppc32_CIA(5) |
| mr 3,31 /* r3 = new gsp value */ |
| b run_innerloop_exit |
| /*NOTREACHED*/ |
| |
| counter_is_zero: |
| /* %CIA is up to date */ |
| /* back out decrement of the dispatch counter */ |
| addi 29,29,1 |
| li 3,VG_TRC_INNER_COUNTERZERO |
| b run_innerloop_exit |
| |
| fast_lookup_failed: |
| /* %CIA is up to date */ |
| /* back out decrement of the dispatch counter */ |
| addi 29,29,1 |
| li 3,VG_TRC_INNER_FASTMISS |
| b run_innerloop_exit |
| |
| |
| |
| /* All exits from the dispatcher go through here. |
| r3 holds the return value. |
| */ |
| run_innerloop_exit: |
| /* We're leaving. Check that nobody messed with |
| VSCR or FPSCR. */ |
| |
| /* Using r10 - value used again further on, so don't trash! */ |
| lis 10,VG_(machine_ppc32_has_FP)@ha |
| lwz 10,VG_(machine_ppc32_has_FP)@l(10) |
| cmplwi 10,0 |
| beq LafterFP8 |
| |
| /* Set fpscr back to a known state, since vex-generated code |
| may have messed with fpscr[rm]. */ |
| li 5,0 |
| addi 1,1,-16 |
| stw 5,0(1) |
| lfs 3,0(1) |
| addi 1,1,16 |
| mtfsf 0xFF,3 /* fpscr = f3 */ |
| LafterFP8: |
| |
| /* Using r11 - value used again further on, so don't trash! */ |
| lis 11,VG_(machine_ppc32_has_VMX)@ha |
| lwz 11,VG_(machine_ppc32_has_VMX)@l(11) |
| cmplwi 11,0 |
| beq LafterVMX8 |
| |
| #ifdef HAS_ALTIVEC |
| /* Check VSCR[NJ] == 1 */ |
| /* first generate 4x 0x00010000 */ |
| vspltisw 4,0x1 /* 4x 0x00000001 */ |
| vspltisw 5,0x0 /* zero */ |
| vsldoi 6,4,5,0x2 /* <<2*8 => 4x 0x00010000 */ |
| /* retrieve VSCR and mask wanted bits */ |
| mfvscr 7 |
| vand 7,7,6 /* gives NJ flag */ |
| vspltw 7,7,0x3 /* flags-word to all lanes */ |
| vcmpequw. 8,6,7 /* CR[24] = 1 if v6 == v7 */ |
| bt 24,invariant_violation /* branch if all_equal */ |
| #endif |
| LafterVMX8: |
| |
| /* otherwise we're OK */ |
| b run_innerloop_exit_REALLY |
| |
| |
| invariant_violation: |
| li 3,VG_TRC_INVARIANT_FAILED |
| b run_innerloop_exit_REALLY |
| |
| run_innerloop_exit_REALLY: |
| /* r3 holds VG_TRC_* value to return */ |
| |
| /* Return to parent stack */ |
| addi 1,1,16 |
| |
| /* Write ctr to VG(dispatch_ctr) */ |
| lis 5,VG_(dispatch_ctr)@ha |
| stw 29,VG_(dispatch_ctr)@l(5) |
| |
| /* Restore cr */ |
| lwz 0,44(1) |
| mtcr 0 |
| |
| /* Restore callee-saved registers... */ |
| |
| /* r10 already holds VG_(machine_ppc32_has_FP) value */ |
| cmplwi 10,0 |
| beq LafterFP9 |
| |
| /* Floating-point regs */ |
| lfd 31,488(1) |
| lfd 30,480(1) |
| lfd 29,472(1) |
| lfd 28,464(1) |
| lfd 27,456(1) |
| lfd 26,448(1) |
| lfd 25,440(1) |
| lfd 24,432(1) |
| lfd 23,424(1) |
| lfd 22,416(1) |
| lfd 21,408(1) |
| lfd 20,400(1) |
| lfd 19,392(1) |
| lfd 18,384(1) |
| lfd 17,376(1) |
| lfd 16,368(1) |
| lfd 15,360(1) |
| lfd 14,352(1) |
| LafterFP9: |
| |
| /* General regs */ |
| lwz 31,348(1) |
| lwz 30,344(1) |
| lwz 29,340(1) |
| lwz 28,336(1) |
| lwz 27,332(1) |
| lwz 26,328(1) |
| lwz 25,324(1) |
| lwz 24,320(1) |
| lwz 23,316(1) |
| lwz 22,312(1) |
| lwz 21,308(1) |
| lwz 20,304(1) |
| lwz 19,300(1) |
| lwz 18,296(1) |
| lwz 17,292(1) |
| lwz 16,288(1) |
| lwz 15,284(1) |
| lwz 14,280(1) |
| lwz 13,276(1) |
| |
| /* r11 already holds VG_(machine_ppc32_has_VMX) value */ |
| cmplwi 11,0 |
| beq LafterVMX9 |
| |
| #ifdef HAS_ALTIVEC |
| /* VRSAVE */ |
| lwz 4,244(1) |
| mfspr 4,256 /* VRSAVE reg is spr number 256 */ |
| |
| /* Vector regs */ |
| li 4,224 |
| lvx 31,4,1 |
| li 4,208 |
| lvx 30,4,1 |
| li 4,192 |
| lvx 29,4,1 |
| li 4,176 |
| lvx 28,4,1 |
| li 4,160 |
| lvx 27,4,1 |
| li 4,144 |
| lvx 26,4,1 |
| li 4,128 |
| lvx 25,4,1 |
| li 4,112 |
| lvx 24,4,1 |
| li 4,96 |
| lvx 23,4,1 |
| li 4,80 |
| lvx 22,4,1 |
| li 4,64 |
| lvx 21,4,1 |
| li 4,48 |
| lvx 20,4,1 |
| #endif |
| LafterVMX9: |
| |
| /* reset lr & sp */ |
| lwz 0,500(1) /* stack_size + 4 */ |
| mtlr 0 |
| addi 1,1,496 /* stack_size */ |
| blr |
| .size VG_(run_innerloop), .-VG_(run_innerloop) |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- ---*/ |
| /*--- A special dispatcher, for running no-redir ---*/ |
| /*--- translations. Just runs the given translation once. ---*/ |
| /*--- ---*/ |
| /*------------------------------------------------------------*/ |
| |
| /* signature: |
| void VG_(run_a_noredir_translation) ( UWord* argblock ); |
| */ |
| |
| /* Run a no-redir translation. argblock points to 4 UWords, 2 to carry args |
| and 2 to carry results: |
| 0: input: ptr to translation |
| 1: input: ptr to guest state |
| 2: output: next guest PC |
| 3: output: guest state pointer afterwards (== thread return code) |
| */ |
| .global VG_(run_a_noredir_translation) |
| .type VG_(run_a_noredir_translation), @function |
| VG_(run_a_noredir_translation): |
| /* save callee-save int regs, & lr */ |
| stwu 1,-256(1) |
| stw 14,128(1) |
| stw 15,132(1) |
| stw 16,136(1) |
| stw 17,140(1) |
| stw 18,144(1) |
| stw 19,148(1) |
| stw 20,152(1) |
| stw 21,156(1) |
| stw 22,160(1) |
| stw 23,164(1) |
| stw 24,168(1) |
| stw 25,172(1) |
| stw 26,176(1) |
| stw 27,180(1) |
| stw 28,184(1) |
| stw 29,188(1) |
| stw 30,192(1) |
| stw 31,196(1) |
| mflr 31 |
| stw 31,200(1) |
| |
| stw 3,204(1) |
| lwz 31,4(3) |
| lwz 30,0(3) |
| mtlr 30 |
| blrl |
| |
| lwz 4,204(1) |
| stw 3, 8(4) |
| stw 31,12(4) |
| |
| lwz 14,128(1) |
| lwz 15,132(1) |
| lwz 16,136(1) |
| lwz 17,140(1) |
| lwz 18,144(1) |
| lwz 19,148(1) |
| lwz 20,152(1) |
| lwz 21,156(1) |
| lwz 22,160(1) |
| lwz 23,164(1) |
| lwz 24,168(1) |
| lwz 25,172(1) |
| lwz 26,176(1) |
| lwz 27,180(1) |
| lwz 28,184(1) |
| lwz 29,188(1) |
| lwz 30,192(1) |
| lwz 31,200(1) |
| mtlr 31 |
| lwz 31,196(1) |
| addi 1,1,256 |
| blr |
| .size VG_(run_a_noredir_translation), .-VG_(run_a_noredir_translation) |
| |
| |
| /* Let the linker know we don't need an executable stack */ |
| .section .note.GNU-stack,"",@progbits |
| |
| #endif // defined(VGP_ppc32_linux) |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end ---*/ |
| /*--------------------------------------------------------------------*/ |
